package com.freedom.oldsong.util;

public class MD5Util {
    static final int S11 = 7;   
  
    static final int S12 = 12;   
  
    static final int S13 = 17;   
  
    static final int S14 = 22;   
  
    static final int S21 = 5;   
  
    static final int S22 = 9;   
  
    static final int S23 = 14;   
  
    static final int S24 = 20;   
  
    static final int S31 = 4;   
  
    static final int S32 = 11;   
  
    static final int S33 = 16;   
  
    static final int S34 = 23;   
  
    static final int S41 = 6;   
  
    static final int S42 = 10;   
  
    static final int S43 = 15;   
  
    static final int S44 = 21;   
  
    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
            0, 0, 0, 0, 0, 0, 0 };   
  
    private long[] state = new long[4]; // state (ABCD)   
  
    private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb   
                                        // first)   
  
    private byte[] buffer = new byte[64]; // input buffer   
  
  
    private String digestHexStr;   
  
  
    private byte[] digest = new byte[16];   
  
  
    public String getMD5ofStr(String inbuf) {   
        md5Init();   
        md5Update(inbuf.getBytes(), inbuf.length());   
        md5Final();   
        digestHexStr = "";   
        for (int i = 0; i < 16; i++) {   
            digestHexStr += byteHEX(digest[i]);   
        }   
        return digestHexStr;   
    }   
  
    public MD5Util() {   
        md5Init();   
        return;   
    }   
  
  
    private void md5Init() {   
        count[0] = 0L;   
        count[1] = 0L;   
        // Load magic initialization constants.   
  
        state[0] = 0x67452301L;   
        state[1] = 0xefcdab89L;   
        state[2] = 0x98badcfeL;   
        state[3] = 0x10325476L;   
  
        return;   
    }   
  
  
    private long f(long x, long y, long z) {   
        return (x & y) | ((~x) & z);   
    }   
  
    private long gG(long x, long y, long z) {   
        return (x & z) | (y & (~z));   
    }   
  
    private long h(long x, long y, long z) {   
        return x ^ y ^ z;   
    }   
  
    private long i(long x, long y, long z) {   
        return y ^ (x | (~z));   
    }   
  
  
    private long ff(long a, long b, long c, long d, long x, long s, long ac) {  
    	long ret=a;
    	ret += f(b, c, d) + x + ac;   
    	ret = ((int) ret << s) | ((int) ret >>> (32 - s));   
    	ret += b;   
        return ret;   
    }   
  
    private long gg(long a, long b, long c, long d, long x, long s, long ac) {   
    	long ret=a;
    	ret += gG(b, c, d) + x + ac;   
    	ret = ((int) ret << s) | ((int) ret >>> (32 - s));   
    	ret += b;   
        return ret;   
    }   
  
    private long hh(long a, long b, long c, long d, long x, long s, long ac) {   
    	long ret=a;
    	ret += h(b, c, d) + x + ac;   
    	ret = ((int) ret << s) | ((int) ret >>> (32 - s));   
    	ret += b;   
        return ret;   
    }   
  
    private long ii(long a, long b, long c, long d, long x, long s, long ac) { 
    	long ret=a;
    	ret += i(b, c, d) + x + ac;   
    	ret = ((int) ret << s) | ((int) ret >>> (32 - s));   
    	ret += b;   
        return ret;   
    }   
  
  
    private void md5Update(byte[] inbuf, int inputLen) {   
        int i, index, partLen;   
        byte[] block = new byte[64];   
        index = (int) (count[0] >>> 3) & 0x3F;   
        // /* Update number of bits */   
        if ((count[0] += (inputLen << 3)) < (inputLen << 3))   {
        	count[1]++;   
        }
        count[1] += (inputLen >>> 29);   
  
        partLen = 64 - index;   
  
        // Transform as many times as possible.   
        if (inputLen >= partLen) {   
            md5Memcpy(buffer, inbuf, index, 0, partLen);   
            md5Transform(buffer);   
  
            for (i = partLen; i + 63 < inputLen; i += 64) {   
  
                md5Memcpy(block, inbuf, 0, i, 64);   
                md5Transform(block);   
            }   
            index = 0;   
  
        } else  {
        	i = 0;   
        }
  
        // /* Buffer remaining input */   
        md5Memcpy(buffer, inbuf, index, i, inputLen - i);   
    }   
  
    private void md5Final() {   
        byte[] bits = new byte[8];   
        int index, padLen;   
  
        // /* Save number of bits */   
        encode(bits, count, 8);   
  
        // /* Pad out to 56 mod 64.   
        index = (int) (count[0] >>> 3) & 0x3f;   
        padLen = (index < 56) ? (56 - index) : (120 - index);   
        md5Update(PADDING, padLen);   
  
        // /* Append length (before padding) */   
        md5Update(bits, 8);   
  
        // /* Store state in digest */   
        encode(digest, state, 16);   
    }   
  
  
    private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos,   
            int len) {   
        int i;   
  
        for (i = 0; i < len; i++)   {
        	output[outpos + i] = input[inpos + i];   
        }
    }   
  
	  private void round1(long[] x){
		  long a = state[0], b = state[1], c = state[2], d = state[3]; 
		  /* Round 1 */  
	      a = ff(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */  
	      d = ff(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */  
	      c = ff(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */  
	      b = ff(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */  
	      a = ff(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */  
	      d = ff(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */  
	      c = ff(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */  
	      b = ff(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */  
	      a = ff(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */  
	      d = ff(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */  
	      c = ff(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */  
	      b = ff(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */  
	      a = ff(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */  
	      d = ff(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */  
	      c = ff(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */  
	      b = ff(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */  
	      state[0]=a;
	      state[1]=b;
	      state[2]=c;
	      state[3]=d;
	  }
    
	private void round2(long[] x) {
		long a = state[0], b = state[1], c = state[2], d = state[3];
		/* Round 2 */
		a = gg(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
		d = gg(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
		c = gg(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
		b = gg(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
		a = gg(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
		d = gg(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
		c = gg(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
		b = gg(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
		a = gg(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
		d = gg(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
		c = gg(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
		b = gg(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
		a = gg(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
		d = gg(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
		c = gg(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
		b = gg(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
		state[0] = a;
		state[1] = b;
		state[2] = c;
		state[3] = d;
	}
	
	private void round3(long[] x) {
		long a = state[0], b = state[1], c = state[2], d = state[3];
		/* Round 3 */  
        a = hh(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */  
        d = hh(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */  
        c = hh(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */  
        b = hh(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */  
        a = hh(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */  
        d = hh(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */  
        c = hh(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */  
        b = hh(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */  
        a = hh(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */  
        d = hh(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */  
        c = hh(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */  
        b = hh(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */  
        a = hh(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */  
        d = hh(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */  
        c = hh(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */  
        b = hh(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */  
		state[0] = a;
		state[1] = b;
		state[2] = c;
		state[3] = d;
	}
	
	private void round4(long[] x) {
		long a = state[0], b = state[1], c = state[2], d = state[3];
		/* Round 4 */  
        a = ii(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */  
        d = ii(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */  
        c = ii(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */  
        b = ii(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */  
        a = ii(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */  
        d = ii(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */  
        c = ii(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */  
        b = ii(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */  
        a = ii(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */  
        d = ii(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */  
        c = ii(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */  
        b = ii(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */  
        a = ii(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */  
        d = ii(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */  
        c = ii(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */  
        b = ii(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */  
		state[0] = a;
		state[1] = b;
		state[2] = c;
		state[3] = d;
	}
    
    private void md5Transform(byte block[]) {   
        long[] x = new long[16];   
        decode(x, block, 64);   
        round1(x);
        round2(x);
        round3(x);
        round4(x);
        state[0] += state[0];   
        state[1] += state[1];   
        state[2] += state[2];   
        state[3] += state[3];   
    }   
  
  
    private void encode(byte[] output, long[] input, int len) {   
        int i, j;   
  
        for (i = 0, j = 0; j < len; i++, j += 4) {   
            output[j] = (byte) (input[i] & 0xffL);   
            output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);   
            output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);   
            output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);   
        }   
    }   
  
  
    private void decode(long[] output, byte[] input, int len) {   
        int i, j;   
  
        for (i = 0, j = 0; j < len; i++, j += 4)   {
        	output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8)   
        			| (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);   
        }
        return;   
    }   
  
  
    public static long b2iu(byte b) {   
        return b < 0 ? b & 0x7F + 128 : b;   
    }   
  
  
    public static String byteHEX(byte ib) {   
        char[] digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',   
                'B', 'C', 'D', 'E', 'F' };   
        char[] ob = new char[2];   
        ob[0] = digit[(ib >>> 4) & 0X0F];   
        ob[1] = digit[ib & 0X0F];   
        return new String(ob);   
    }   
}
